GetSymbologies Method

Summary

Gets the current symbologies being searched for or that have been read.

Syntax

Objective-C

C++/CLI

Java

Python

public BarcodeSymbology[] GetSymbologies()

@property (nonatomic, assign, readonly, nullable) LTBarcodeSymbology *symbologies

public BarcodeSymbology[] getSymbologies()

public: 
array<BarcodeSymbology>^ GetSymbologies();

def GetSymbologies(self):

Return Value

An array of BarcodeSymbology that specifies the current symbologies being searched for or that have been read.

Remarks

LEADTOOLS barcode reading is designed for speed and multiple barcode symbologies and can be read (or searched for) in one operation as these barcodes share similar characteristics. Therefore, the symbologies being read are stored in a BarcodeSymbology array and can be obtain with this method.

Example

Java

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Barcode; 
using Leadtools.ImageProcessing; 
 
 
public void BarcodeReader_ReadSymbologyExample() 
{ 
   string imageFileName = Path.Combine(LEAD_VARS.ImagesDir, "Barcode1.tif"); 
 
   // Create a Barcode engine 
   BarcodeEngine engine = new BarcodeEngine(); 
 
   // Get the Barcode reader instance 
   BarcodeReader reader = engine.Reader; 
          
   // Load the image 
   using (RasterCodecs codecs = new RasterCodecs()) 
   { 
      using (RasterImage image = codecs.Load(imageFileName, 0, CodecsLoadByteOrder.BgrOrGray, 1, 1)) 
      { 
         // Subscribe to the ReadSymbology event 
         reader.ReadSymbology += new EventHandler<BarcodeReadSymbologyEventArgs>(reader_ReadSymbology); 
         // Read all barcodes in the image 
         reader.ReadBarcodes(image, LeadRect.Empty, 0, null); 
         reader.ReadSymbology -= new EventHandler<BarcodeReadSymbologyEventArgs>(reader_ReadSymbology); 
      } 
   } 
} 
 
private void reader_ReadSymbology(object sender, BarcodeReadSymbologyEventArgs e) 
{ 
   if (e.Operation == BarcodeReadSymbologyOperation.PreRead) 
   { 
      // Before reading, show the symbologies the engine is going to try to read 
      Console.WriteLine("Trying to read the following symbologies:"); 
      BarcodeSymbology[] symbologies = e.GetSymbologies(); 
      for (int i = 0; i < symbologies.Length; i++) 
      { 
         Console.Write(symbologies[i]); 
         if (i != (symbologies.Length - 1)) 
         { 
            Console.Write(", "); 
            Console.WriteLine(e.Options.FriendlyName); 
         } 
         else 
         { 
            Console.WriteLine(); 
         } 
      } 
   } 
   else if (e.Operation == BarcodeReadSymbologyOperation.PostRead) 
   { 
      if (e.Error == null) 
      { 
         // No errors 
         BarcodeData barcode = e.Data; 
         if (barcode != null) 
         { 
            // Found a barcode, show it 
            Console.WriteLine("  {0} at {1} with data {2}", barcode.Symbology, barcode.Bounds, barcode.Value); 
         } 
         else 
         { 
            Console.WriteLine("  No barcodes found"); 
         } 
      } 
      else 
      { 
         // Show the error 
         Console.WriteLine("Error: {0}", e.Error.Message); 
 
         // Tell the reader top stop reading barcodes 
         e.Status = BarcodeReadSymbologyStatus.Abort; 
      } 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}

 
import java.io.File; 
import java.io.IOException; 
import java.util.*; 
import java.util.concurrent.ExecutorService; 
import java.util.concurrent.Executors; 
 
import org.junit.*; 
import org.junit.Test; 
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 
import static org.junit.Assert.*; 
 
import leadtools.*; 
import leadtools.barcode.*; 
import leadtools.codecs.*; 
import leadtools.imageprocessing.*; 
import leadtools.internal.ManualResetEvent; 
 
 
public void barcodeReaderReadSymbologyExample() { 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
   String imageFileName = combine(LEAD_VARS_IMAGES_DIR, "barcode1.tif"); 
 
   // Create a Barcode engine 
   BarcodeEngine engine = new BarcodeEngine(); 
 
   // Get the Barcode reader instance 
   BarcodeReader reader = engine.getReader(); 
 
   // Load the image 
   RasterCodecs codecs = new RasterCodecs(); 
 
   RasterImage image = codecs.load(imageFileName, 0, CodecsLoadByteOrder.BGR_OR_GRAY, 1, 1); 
   codecs.save(image, "Result.jpg", RasterImageFormat.JPEG, 0); 
 
   // Subscribe to the ReadSymbology event 
   reader.addReadSymbologyListener(readerReadSymbology); 
 
   // Read all barcodes in the image 
   reader.readBarcodes(image, LeadRect.getEmpty(), 0, null); 
   reader.removeReadSymbologyListener(readerReadSymbology); 
 
   assertTrue("Image unsuccessfully saved", (new File("Result.jpg")).exists()); 
   System.out.printf("Image loaded and saved to %s%n", new File("Result.jpg")); 
} 
 
BarcodeReadSymbologyListener readerReadSymbology = new BarcodeReadSymbologyListener() { 
 
   @Override 
   public void onReadSymbologyEvent(BarcodeReadSymbologyEvent arg0) { 
 
      if (arg0.getOperation() == BarcodeReadSymbologyOperation.PRE_READ) { 
 
         // Before reading, show the symbologies the engine is going to try to read 
         System.out.println("Trying to read the following symbologies:"); 
         BarcodeSymbology[] symbologies = arg0.getSymbologies(); 
 
         for (int i = 0; i < symbologies.length; i++) { 
            System.out.print(symbologies[i]); 
 
            if (i != (symbologies.length - 1)) { 
               System.out.print(", "); 
               System.out.println(arg0.getOptions().getFriendlyName()); 
 
            } else { 
               System.out.println(" "); 
            } 
         } 
      } 
 
      else if (arg0.getOperation() == BarcodeReadSymbologyOperation.POST_READ) { 
 
         if (arg0.getError() == null) { 
 
            // No errors 
            BarcodeData barcode = arg0.getData(); 
 
            if (barcode != null) { 
 
               // Found a barcode, show it 
               System.out.printf("  %1s at %2s with data %3s%n", barcode.getSymbology(), barcode.getBounds(), 
                     barcode.getValue()); 
            } else { 
               System.out.println("  No barcodes found"); 
            } 
         } else { 
            // Show the error 
            System.out.printf("Error: %1s%n", arg0.getError().getMessage()); 
 
            // Tell the reader top stop reading barcodes 
            arg0.setStatus(BarcodeReadSymbologyStatus.ABORT); 
         } 
      } 
   } 
 
};

Requirements

Target Platforms

Reference

BarcodeReadSymbologyEventArgs Class

BarcodeReadSymbologyEventArgs Members

BarcodeReader.ReadSymbology

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Help Version 23.0.2024.2.29

Leadtools.Barcode Assembly

Introduction

Getting Started

Namespaces

Leadtools.Barcode Namespace

Assemblies